Spatiotemporal Distributions of δD in Atmospheric Water Vapor Based on TES Data During 2004-2009  

作　　者：章新平 张新主 关华德 黄一民 吴华武 

机构地区：[1]College of Resources and Environmental Sciences, Hunan Normal University [2]School of the Environment, Flinders University

出　　处：《Acta meteorologica Sinica》2012年第6期683-699,共17页

基　　金：Supported by the National Natural Science Foundation of China (40871094 and 41171035);Construction Program of the Key Discipline in Hunan Province (2012001);Open Fund of Key Laboratory of Tibetan Environment Changes and Land Surface Processes of the Chinese Academy of Sciences (2011004);Scientific Research Fund of Hunan Provincial Education Department (09A056)

摘　　要：The spatial and temporal distributions of the stable isotopes such as HD16O （or 1H2H16O, or HDO） and H2 18O in atmospheric water vapor are related to evaporation in source places, vapor condensation during transport, and vapor convergence and divergence, and thus provide useful information for investigation and understanding of the global water cycle. This paper analyzes spatiotemporal variations of the content of iso- tope HDO （i.e., 5D）, in atmospheric water vapor, namely, δDv, and the relationship of δDv with atmospheric humidity and temperature at different levels in the troposphere, using the HDO and H2O data retrieved from the Tropospheric Emission Spectrometer （TES） at seven pressure levels from 825 to 100 hPa. The results indicate that δDv has a clear zonal distribution in the troposphere and a good correspondence with atmospheric precipitable water. The results also show that δDv decreases logarithmically with atmospheric pressure and presents a decreasing trend from the equator to high latitudes and from lands to oceans. Sea- sonal changes of δDv exhibit regional differences. The spatial distribution and seasonal variation of δDv in the low troposphere are consistent with those in the middle troposphere, but opposite situations occur from the upper troposphere to the lower stratosphere. The correlation between δDv and temperature has a similar distribution pattern to the correlation between δDv and precipitable water in the troposphere. The stable isotope HDO in water vapor （δDv）, compared with that in precipitation （δDp）, is of some differences in spatial distribution and seasonal variation, and in its relationship with temperature and humidity, in- dicating that the impacts of stable isotopic fractionation and atmospheric circulation on the two types of stable isotopes are different.The spatial and temporal distributions of the stable isotopes such as HD16O （or 1H2H16O, or HDO） and H2 18O in atmospheric water vapor are related to evaporation in source places, vapor condensation during transport, and vapor convergence and divergence, and thus provide useful information for investigation and understanding of the global water cycle. This paper analyzes spatiotemporal variations of the content of iso- tope HDO （i.e., 5D）, in atmospheric water vapor, namely, δDv, and the relationship of δDv with atmospheric humidity and temperature at different levels in the troposphere, using the HDO and H2O data retrieved from the Tropospheric Emission Spectrometer （TES） at seven pressure levels from 825 to 100 hPa. The results indicate that δDv has a clear zonal distribution in the troposphere and a good correspondence with atmospheric precipitable water. The results also show that δDv decreases logarithmically with atmospheric pressure and presents a decreasing trend from the equator to high latitudes and from lands to oceans. Sea- sonal changes of δDv exhibit regional differences. The spatial distribution and seasonal variation of δDv in the low troposphere are consistent with those in the middle troposphere, but opposite situations occur from the upper troposphere to the lower stratosphere. The correlation between δDv and temperature has a similar distribution pattern to the correlation between δDv and precipitable water in the troposphere. The stable isotope HDO in water vapor （δDv）, compared with that in precipitation （δDp）, is of some differences in spatial distribution and seasonal variation, and in its relationship with temperature and humidity, in- dicating that the impacts of stable isotopic fractionation and atmospheric circulation on the two types of stable isotopes are different.

关 键 词：Tropospheric Emission Spectrometer （TES） water vapor stable isotope precipitable water spatial and temporal distributions 

分 类 号：P468.02[天文地球—大气科学及气象学]